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50 OOPS Interview questions

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https://youtu.be/Bd6EeCdDRiw -- Github in one complete video

How to build a Data Science portfolio that truly stands out?

Some practical interview questions for an entry-level data analyst role in Power BI:

•  Data Import Scenario: Describe how you would import data from various sources (Excel,SQL Server, CSV) into Power BI.

•  Data Cleaning Exercise: In Power BI, how would you handle a dataset with missing values and inconsistent formats to prepare it for analysis?

•  Handling Large Datasets: If you're working with a very large dataset in Power BI that is causing performance issues, what strategies would you use to optimize the data processing?

•  Calculated Columns and Measures: Explain how you would use calculated columns and measures in Power BI to analyze year-over-year growth.

•  Data Modeling Case: You have sales data in one table and customer data in another. How would you create a data model in Power BI to analyze customer purchase behavior?

•  Visualizations Task: Describe your approach to visualizing sales data in Power BI to highlight trends over time across different product categories.

•  Dashboard Optimization: A Power BI dashboard is loading slowly. What steps would you take to diagnose and improve its performance?

•  Data Refresh Scheduling: How would you set up and manage automatic data refreshes for a weekly sales report in Power BI?

•  Row-Level Security: How would you implement user-level security in Power BI for a report that needs different access levels for various users?

•  Troubleshooting a DAX Calculation: If a DAX formula in Power BI is not returning the expected results, how would you go about troubleshooting it?

•  Integration with Other Tools: Describe a scenario where you integrated Power BI with another tool or service (like Excel, Azure, or a web API).

•  Interactive Reports Creation: How would you design a Power BI report that allows user interaction, such as using slicers or drill-down features?

•  Adapting to Data Source Changes: If there are structural changes in a primary data source (like addition or removal of columns), how would you update your Power BI reports and dashboards?

•  Sharing Reports: Explain how you would share a report with your team and set up access controls using Power BI Service.
•  SQL Queries in Power BI: How do you use SQL queries in Power BI for advanced data transformation or analysis?

•  Error Handling in Data Sources: How do you manage and resolve errors in data sources or calculations in Power BI?

•  Custom Visuals Usage: Have you used custom visuals in Power BI? Describe the scenario and the benefit

•  Collaboration in Power BI Projects: Discuss how you have worked with others on a Power BI project. What collaboration tools or features within Power BI did you utilize?

•  Performance Tuning: What steps do you take to ensure your Power BI reports are performing optimally when dealing with large datasets or complex calculations?

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Experience : 0-3 Years
Location : Gurugram

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